Default last.fm account to 0 to prevent hammering the DB due to an undef
value.
Backport PreventStandby changes from 7.8 to support OSX
Update the OSX installer to a .pkg file

Change-Id: Ia3c0d94b7927dc2009371e025ecfd4127016dcd2
Merge branch 'feature/osx-ml-compatibility' into public/7.7
Merge branch 'public/7.7' into public/7.8